I built a guitar amp. It consists of various circuit boards (pre amps, equalizer, second tube preamp, tube power amp, various power supply modules etc.) mounted in an alu chassis. I also have a very sensitive AC level meter, down to -120dB, to measure noise etc.
All the individual components work and now I wired the whole thing up and I am disappointed about the noise level.
The chassis is grounded via a grounded outlet, all the other components are connected via coax with each other-so they have a common ground but I have not connected that signal ground to the chassis ground.
In addition to the signal coax cables there are other control cables for power for the op amps, dc for tube heaters, switches etc. which connect the modules.
The overall noise and hum level increases as I connect more and more modules and I think I am picking up noise via the power and control cables and would love to hear a general outline as to how to best wire up a project like this to keep noise out as much as possible.
Uwe
All the individual components work and now I wired the whole thing up and I am disappointed about the noise level.
The chassis is grounded via a grounded outlet, all the other components are connected via coax with each other-so they have a common ground but I have not connected that signal ground to the chassis ground.
In addition to the signal coax cables there are other control cables for power for the op amps, dc for tube heaters, switches etc. which connect the modules.
The overall noise and hum level increases as I connect more and more modules and I think I am picking up noise via the power and control cables and would love to hear a general outline as to how to best wire up a project like this to keep noise out as much as possible.
Uwe